Do you think it's a software issue or hardware? I'm using a PCIe adapter since my motherboard is a bit older and doesn't have a NVMe slot.

My motherboard is Gigabyte Z87X-UD5H The adapter I'm using is this one: https://www.amazon.com/gp/product/B07JKR5C3Z/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1